金属热处理 ›› 2022, Vol. 47 ›› Issue (9): 6-11.DOI: 10.13251/j.issn.0254-6051.2022.09.002

• 工艺研究 • 上一篇    下一篇

时效处理对挤压成型2195铝锂合金组织和力学性能的影响

王志文1, 杨荣东2, 黄元春1, 李辉3   

  1. 1.中南大学 轻合金研究院, 湖南 长沙 410083;
    2.西南铝业有限责任公司, 重庆 401326;
    3.中南大学 机电工程学院, 湖南 长沙 410083
  • 收稿日期:2022-04-21 修回日期:2022-07-01 发布日期:2022-10-18
  • 通讯作者: 杨荣东,高级工程师,硕士,E-mail: yangrd_swa@163.com
  • 作者简介:王志文(1995—),男,硕士研究生,主要研究方向为铝锂合金的热处理强化,E-mail:756757328@qq.com。
  • 基金资助:
    国家自然科学基金(U1837207)

Effect of aging treatment on microstructure and mechanical properties of extruded 2195 Al-Li alloy

Wang Zhiwen1, Yang Rongdong2, Huang Yuanchun1, Li Hui3   

  1. 1. Light Alloy Research Institute, Central South University, Changsha Hunan 410083, China;
    2. Southwest Aluminum Co. , Ltd, Chongqing 401326, China;
    3. School of Mechanical and Electrical Engineering, Central South University, Changsha Hunan 410083, China
  • Received:2022-04-21 Revised:2022-07-01 Published:2022-10-18

摘要: 研究了热处理对挤压态2195铝锂合金组织和力学性能的影响。结果表明,固溶处理和人工时效处理对挤压合金的力学性能有显著的增强作用,这与析出相的类型、尺寸、数量密度和分布有关。2195铝锂合金在时效过程中的析出顺序为过饱和固溶体(SSSS)→GP区+δ′/β′(Al3(Li,Zr))→δ′+θ′(Al2Cu) +T1 (Al2CuLi)→θ′+T1;其中T1相在析出强化中起主导作用。2195铝锂合金经过525 ℃×60 min固溶后在170 ℃人工时效的峰时效时间是36 h,此时抗拉强度、屈服强度和伸长率分别为579 MPa、537 MPa和5.5%。

关键词: 2195铝锂合金, 固溶处理, 时效, 力学性能, 析出相

Abstract: Effect of heat treatment on microstructure and mechanical properties of as-extruded 2195 Al-Li alloy was investigated. The results show that the mechanical properties of the as-extruded alloy can be significantly enhanced by solution treatment and artificial aging treatment, which is related to the type, size, number density and distribution of precipitated phases. The 2195 Al-Li alloy precipitation sequence during the aging process is SSSS(supersaturated solid solution)→GP zone+δ′/β′(Al3(Li,Zr))→δ′+θ′(Al2Cu)+T1(Al2CuLi)→θ′+T1. The T1 phase plays a leading role in precipitation strengthening. After solution treatment at 525 ℃ for 60 min and artificial aging at 170 ℃, the peak aging time of the 2195 Al-Li alloy is 36 h, under which the tensile strength, yield strength and elongation are 579 MPa, 537 MPa and 5.5%, respectively.

Key words: 2195 Al-Li alloy, solution treatment, aging, mechanical properties, precipitated phase

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